mirror of https://github.com/BTCPrivate/copay.git
84 lines
2.3 KiB
JavaScript
84 lines
2.3 KiB
JavaScript
'use strict';
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var RateService = function(request) {
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this.isAvailable = false;
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this.UNAVAILABLE_ERROR = 'Service is not available - check for service.isAvailable or use service.whenAvailable';
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this.SAT_TO_BTC = 1 / 1e8;
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var MINS_IN_HOUR = 60;
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var MILLIS_IN_SECOND = 1000;
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var rateServiceConfig = config.rate;
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var updateFrequencySeconds = rateServiceConfig.updateFrequencySeconds || 60 * MINS_IN_HOUR;
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var rateServiceUrl = rateServiceConfig.url || 'https://bitpay.com/api/rates';
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this.queued = [];
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this.alternatives = [];
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var that = this;
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var backoffSeconds = 5;
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var retrieve = function() {
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request.get({
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url: rateServiceUrl,
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json: true
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}, function(err, response, listOfCurrencies) {
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if (err) {
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backoffSeconds *= 1.5;
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setTimeout(retrieve, backoffSeconds * MILLIS_IN_SECOND);
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return;
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}
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var rates = {};
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listOfCurrencies.forEach(function(element) {
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rates[element.code] = element.rate;
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that.alternatives.push({
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name: element.name,
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isoCode: element.code,
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rate: element.rate
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});
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});
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that.isAvailable = true;
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that.rates = rates;
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that.queued.forEach(function(callback) {
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setTimeout(callback, 1);
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});
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setTimeout(retrieve, updateFrequencySeconds * MILLIS_IN_SECOND);
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});
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};
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retrieve();
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};
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RateService.prototype.whenAvailable = function(callback) {
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if (this.isAvailable) {
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setTimeout(callback, 1);
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} else {
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this.queued.push(callback);
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}
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};
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RateService.prototype.toFiat = function(satoshis, code) {
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if (!this.isAvailable) {
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throw new Error(this.UNAVAILABLE_ERROR);
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}
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return satoshis * this.SAT_TO_BTC * this.rates[code];
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};
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RateService.prototype.fromFiat = function(amount, code) {
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if (!this.isAvailable) {
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throw new Error(this.UNAVAILABLE_ERROR);
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}
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return amount / this.rates[code] / this.SAT_TO_BTC;
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};
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RateService.prototype.listAlternatives = function() {
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if (!this.isAvailable) {
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throw new Error(this.UNAVAILABLE_ERROR);
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}
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var alts = [];
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this.alternatives.forEach(function(element) {
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alts.push({
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name: element.name,
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isoCode: element.isoCode
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});
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});
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return alts;
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};
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angular.module('copayApp.services').service('rateService', RateService);
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